CALIFORNIA (SS) - THURSDAY was a big day for actress Cameron Diaz – it was her 40th birthday! The star - who’s the youngest of three sisters - was born in San Diego, California. Her mother, Billie (née Early), is an import-export agent, and her father, Emilio Diaz (1949–2008), worked for the California oil company UNOCAL for more than 20 years as a field gauger. “I’m so, so excited about turning 40.